Take the butter and chocolate and put it into a bowl. Then get a saucepan and fill to about a quarter of the way with hot water and then put the bowl on top over the heat.
Take the plain flour and cocoa powder and sieve into a bowl.
Take the eggs and golden caster sugar and whisk them together in a bowl.
Add some vanilla essence to the eggs and sugar and whisk into it.
Mix egg and flour mixes together to make the brownie mix.
Add the white and milk chocolate into the mix and fold in a figure of 8.
Pour into a cooking tray and put into the oven for 25 mins at 180.
Leave to cool for 5 mins and this will be the final result.